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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/UnsignedRightShiftNode.java @ 5657:d71eb56d6bb0

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new stamp inference in CanonicalizerPhase, IntegerStamp.mask
author Lukas Stadler <lukas.stadler@jku.at>
date Tue, 19 Jun 2012 20:03:06 +0200
parents a891c53a295b
children 97d280a879ff
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes.calc;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.spi.*;
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29 import com.oracle.graal.nodes.type.*;
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30
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31 @NodeInfo(shortName = ">>>")
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32 public final class UnsignedRightShiftNode extends ShiftNode implements Canonicalizable, LIRLowerable {
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33
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34 public UnsignedRightShiftNode(Kind kind, ValueNode x, ValueNode y) {
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35 super(kind, x, y);
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36 }
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37
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38 @Override
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39 public boolean inferStamp() {
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40 return updateStamp(StampTool.unsignedRightShift(x().integerStamp(), y().integerStamp()));
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41 }
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42
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43 @Override
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44 public ValueNode canonical(CanonicalizerTool tool) {
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45 if (y().isConstant()) {
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46 int amount = y().asConstant().asInt();
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47 int originalAmout = amount;
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48 int mask;
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49 if (kind() == Kind.Int) {
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50 mask = 0x1f;
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51 } else {
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52 assert kind() == Kind.Long;
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53 mask = 0x3f;
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54 }
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55 amount &= mask;
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56 if (x().isConstant()) {
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57 if (kind() == Kind.Int) {
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58 return ConstantNode.forInt(x().asConstant().asInt() >>> amount, graph());
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59 } else {
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60 assert kind() == Kind.Long;
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61 return ConstantNode.forLong(x().asConstant().asLong() >>> amount, graph());
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62 }
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63 }
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64 if (amount == 0) {
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65 return x();
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66 }
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67 if (x() instanceof ShiftNode) {
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68 ShiftNode other = (ShiftNode) x();
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69 if (other.y().isConstant()) {
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70 int otherAmount = other.y().asConstant().asInt() & mask;
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71 if (other instanceof UnsignedRightShiftNode) {
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72 int total = amount + otherAmount;
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73 if (total != (total & mask)) {
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74 return ConstantNode.forInt(0, graph());
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75 }
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76 return graph().unique(new UnsignedRightShiftNode(kind(), other.x(), ConstantNode.forInt(total, graph())));
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77 } else if (other instanceof LeftShiftNode && otherAmount == amount) {
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78 if (kind() == Kind.Long) {
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79 return graph().unique(new AndNode(kind(), other.x(), ConstantNode.forLong(-1L >>> amount, graph())));
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80 } else {
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81 assert kind() == Kind.Int;
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82 return graph().unique(new AndNode(kind(), other.x(), ConstantNode.forInt(-1 >>> amount, graph())));
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83 }
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84 }
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85 }
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86 }
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87 if (originalAmout != amount) {
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88 return graph().unique(new UnsignedRightShiftNode(kind(), x(), ConstantNode.forInt(amount, graph())));
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89 }
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90 }
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91 return this;
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92 }
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93
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94 @Override
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95 public void generate(LIRGeneratorTool gen) {
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96 gen.setResult(this, gen.emitUShr(gen.operand(x()), gen.operand(y())));
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97 }
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98 }